[BugFix] Handle Lock/RLock types in EnvCreator

[vmoens]

Stack from ghstack (oldest at bottom):

• [Test] Use class references instead of lambdas in transform tests #3279
• [Test] Add test for lambda wrapping in ParallelEnv #3278
• [Feature] Auto-wrap lambda functions with EnvCreator for spawn compatibility #3277
• [Test] Ensure collector shutdown with try/finally #3276
• [Test] Add filterwarnings for unclosed resources #3275
• [Test] Add retry decorator to flaky vecnorm test #3274
• [Test] Simplify num_threads test to check threads in env factory #3273
• [Refactor] Move decorate_thread_sub_func to torchrl.testing.mp_helpers #3272
• -> [BugFix] Handle Lock/RLock types in EnvCreator #3271
• [BugFix] Defer filter_warnings import to avoid module load issues #3270
• [BugFix] Fix CUDA sync in forked subprocess #3269
• [CI] Add --upgrade flag for torch installs and install ffmpeg/xvfb #3268

[pytorch-bot]

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